Because he felt like it
No , this decision came later during his presidency .
1975
It forced French troops to leave Vietnam and divided Vietnam into two countries. (A)
because he wanted to stop the spread of communism. because of the domino theory if 1 country were to fall then neighboring countries would fall to communism as well and he wanted to prevent that from happening
Communists would take over South Vietnam
France agreed to withdraw its troops
During the Kennedy administration in 1961.
The US asked him to.
That is up to you to decide but in my opinion it would be Shawn Johnson
yes
Run for a second term as President of the United States.
After Kennedy was killed, Johnson took over as president and escalated from 16,000 troops to 550,000 troops. Though the war was winnable at smaller levels than that, he didn't win it. Pressure from the media and the American Public about his handling of the war made him decide not to run for re-election.